Counter-shaft bracket for watch-makersj lathes



(No Model.)

B. RIVETT.-

COUNTER SHAFT BRACKET FOR WATCH MAKERS LATHES. No. 375,770. PatentedJan. 3, 1888.

WITNEEEEE- INVENTU N PETERS, Pholo-Lhhqnphor. Wahinglnn. 0. c.

UNITED STATES PATENT OFFICE.

EDWARD RIVETT, OF BOSTON, MASSACHUSETTS.

COUNTER-SHAFT BRACKET FOR WATCH-MAKERS LATHES.

SPECIFICATION forming part of Letters Patent No. 375,?70 dated January3, 1888.

Application filed March 23, 1887. Serial No. 232,085. (No model.)

To all whom it may concern.-

Be it known that I, EDWARD RIVET'I, a citizen of the United States, anda resident of Boston, in the county of Suffolk and State ofMassachusetts, have invented new and useful Improvements in CounterShafts for Watch- Makers Lathes, of which the following, taken inconnection with the accompanying drawings, is a specification.

This invention relates to improvements in counter-shafts for watchmakerslathes and similar tools, and it is carried out as follows, referencebeing had to the accompanying drawings, wherein- Figure 1 represents afront elevation of the invention, and Fig. 2 represents a side view ofit. Fig. 3 represents a cap or plug adapted to be inserted in the socketof the lower part of the structure when its upper part isremoved, aswill behereinafter more fully shown and described.

Similar letters refer to similar parts wherever they occur on thedifferent parts of the drawings.

A in the drawings is the post or standard, adapted to be secured to thetable B by means of a sorew-bolt and nut or thumb-screw, as usual. Thepost A has in its upper end a ringshaped frame, A, with side bearings, aa, for the main counter-shaft O, to which is secured within theringshapcd frame A the pulley O, to which a rotary motionis conveyed bymeans of a belt from a corresponding rotary pulley below the table 13,such latter pulley being, however, not shown in the drawings, as itforms no part of my present invention.

Outside of the ring-shaped frame A is secured to the main countershatt Othe conepulley D, having a series of circumferential grooves ofincreasing size, as is usual in counter-shafts of this kind, and bymeans of said cone-pulley and a strap, d, leading from it to the pulleyon thelathe-spindle, thelatteris set in a rotary motion, as usual. Thering-shaped frame A projects abovethe pulley O, as shown in Figs. 1 and2, by which great strength is obtai ned, preventingthebearingsa a fromgetting out of a linear position relative to the main counter-shaft O,particularly so while said bear ings are being bored out and during theoperation of finishing the post and frame A A and its bearings a a.Saidringshaped frame A also serves as a guard above the pulley O,preventing the operators hands or clothing from getting accidentallycaught, as well as protecting said pulley from injury if heavy objectsshould accidentally drop on said ringshaped frame A.

On the frame A or any other stationary part of the structure I make asocket, A, (shown in Figs. 1 and 2,) adapted to receive the lower end ofthe bent rod or pipe E, as shown, said rod being curved to one sidebetween its upper and lower ends, and has. attached to its upper end theforked bearing piece E, having bearings e efor the secondarycouutershaft F, as shown in Figs. 1 and 2. Outside of the bearings c eare secured to the counter shaft F the respective cord or belt pulleysfandf, as shown in said Figsl and 2.

By means of a cord or belt, G, leading from the grooved cone-pulley D tothe pulley f, a rotary motion is imparted to the counter-shaf t F, andby means of the cord or belt G, leading from the large pulleyf on shaftF to a pulley on that part of the lathe that is to be rotated-such as,forinstance, a drill, grinder, polisher, &c.a quick rotary motion isimparted to the latter. The curved rod or pipe E is preferably madeslightly yielding or elastic, so as to obtain a proper tension on thecords or belts G and G by the springy nature of such rod or pipe. Bythis arrangement of the curved or bent rod E, its counter-shaft F, andpulleys attached to it, as described, I am able to convey a very quickrotary motion to the desired tool in the tail-stock or other portion ofthe watch-makers lathe or other machine, as may be desired, and suchmotion is made nearly positive on account of the long cords orbelts G Gthat I am enabled to use by having the secondary counter-shaft F locatedoverhead, and being so arranged the desired quick rotary motion isconveyed to the desired tool without interfering with the properexecution of the work to be done.

When not needed for use,thebcnt orcurved rod E and its uppercountershaft, F, and pulleysff can be swung to one side, as shown indotted lines in Fig. 1, and previous to swinging it out of the way, asdescribed, the cords G G are to be detached from their respectivepulleys. During such operation of swinging the counter-shaft F and itspulleys to one side the lower end of the rod E is turned within thesocket A"; or, if so desired, the said rod E may be detached from suchsocket and the plug A (shown in Fig; 3) inserted in socket A, if sodesired, to improve the appearance of the device.

Having thus fully described the nature, construction, and operation ofmy invention, I wish to secure by Letters Patent and claim The standardA and its ring-shaped bearing A, having shaft Ojournaled therein, andhaving pulley 0 within the ring-shaped bearing A, and cone-pulley Doutside of the same, both secured to said shaft 0, and the socket A inthe upper end of the ring shaped bearing A, in combination with thedetachable bent rod or pipe E, having the bearing-piece '20 I andbearings E e a secured to its upper end, the shaft F, journaled in saidbearings and provided with the pulley f, belted to the conepulley D bymeans of cord or belt G, and having the pulleyf, for conveying a rotary25 motion to the lathe or other tool, substantially as and for thepurpose set forth.

In testimony whereofI have signed my name to this specification, in thepresence of two sub scribing witnesses, on this 19th day of March, 0 A.D. 1887.

EDWARD VRIVETT.

V Witnesses:

ALBAN ANDREN, HENRY CHADBOURN.

